20311351230251 has 4 divisors (see below), whose sum is σ = 20377511983752. Its totient is φ = 20245190476752.

The previous prime is 20311351230241. The next prime is 20311351230281. The reversal of 20311351230251 is 15203215311302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20311351230251 - 2³⁴ = 20294171361067 is a prime.

It is a super-2 number, since 2×20311351230251² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20311351230241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33080376290 + ... + 33080376903.

It is an arithmetic number, because the mean of its divisors is an integer number (5094377995938).

Almost surely, 2^{20311351230251} is an apocalyptic number.

20311351230251 is a deficient number, since it is larger than the sum of its proper divisors (66160753501).

20311351230251 is an equidigital number, since it uses as much as digits as its factorization.

20311351230251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66160753500.

The product of its (nonzero) digits is 5400, while the sum is 29.

Adding to 20311351230251 its reverse (15203215311302), we get a palindrome (35514566541553).

The spelling of 20311351230251 in words is "twenty trillion, three hundred eleven billion, three hundred fifty-one million, two hundred thirty thousand, two hundred fifty-one".